Evaluation of sputum smear microscopy in the National Tuberculosis Control Programme in the north of Vietnam
Abstract:OBJECTIVE: To assess the yield of sputum smear microscopy and sex differences in the National Tuberculosis Control Programme in the north of Vietnam.
METHODS: Review of registers of 30 randomly selected laboratories (26 district, 4 provincial level).
RESULTS: The average daily workload per technician was 4.4 examinations in district and 5.3 examinations in provincial laboratories. To find one smear-positive case, 9.7 suspects were examined and 29.3 smears done. The smear-positive rate (mean 10.3%) was higher among men (11.6%) than among women (8.4%, P < 0.001). There were more men than women among tuberculosis (TB) suspects (male:female ratio 1.36, 95%CI 1.19–1.54), but even more so among smear-positive patients (1.89, 95%CI 1.64–2.14), irrespective of specimen quality and number of smears examined. Three smears were examined for 18055 suspects (61.7%). The incremental gain was 33.5% and 4.9% for the second and third smear examination, respectively; 186 (95%CI 160–221) smears needed to be examined to find one additional case of TB with a third serial examination.
CONCLUSION: The diagnostic process seemed generally efficient. The male:female ratios suggest higher TB incidence in men rather than lower access to TB facilities for women. The third smear examination could be omitted.
Document Type: Regular Paper
Affiliations: 1: National Hospital of Tuberculosis and Respiratory Diseases, Hanoi, Vietnam; and Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands 2: National Hospital of Tuberculosis and Respiratory Diseases, Hanoi, Vietnam 3: KNCV Tuberculosis Foundation, The Hague, The Netherlands 4: Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands; and KNCV Tuberculosis Foundation, The Hague, The Netherlands
Publication date: March 1, 2006
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